Crystal's MCW Coder HubTags: compliance medical-necessity inpatient
🏥Definition
Services must be reasonable and necessary for diagnosis and treatment of the patient’s condition.
❤️🩹Medicare Inpatient Criteria
Two-Midnight Rule
- Inpatient: Physician expects care to span 2+ midnights
- Observation: Physician expects care to span <2 midnights
Status Matters
Billing inpatient E/M codes for observation patients is a common audit trigger. Verify patient status before billing.
🔗 Documentation Elements
| Element | Requirement |
|---|---|
| Admission Order | Written by physician |
| Principal Diagnosis | ICD-10 supporting inpatient level |
| Severity of Illness | Acute symptoms, instability |
| Intensity of Service | IV meds, frequent monitoring |
| Risk of Mortality | Potential for deterioration |
🩻Inpatient vs. Observation
| Factor | Inpatient | Observation |
|---|---|---|
| Expected Stay | 2+ midnights | <2 midnights |
| E/M Codes | 99221-99233 | 99202-99215 + POS 22 |
| Discharge | 99238-99239 | 99212-99215 |
📋 Supporting Medical Necessity
Admission Criteria Met:
- Acute onset chest pain
- Troponin elevation
- Requires cardiac monitoring
- Expected stay: 3 days
Utilization Review
Work with UR/Case Management to ensure status matches clinical picture. Document status discussions in medical record.
00 Inpatient ProFee Coding MOC Documentation Requirements Inpatient CMS Medicare Guidelines Inpatient